So, I bought an iPhone 3G from someone. And it wasn't activated. I didn't have an O2 SIM with me and I didn't know what type of O2 SIM I needed so... I really wanted to play around on it and I couldn't so I jailbroke it with Quickpwn. That worked and it passed the activation screen. So I played around on it and whatnot until I could get ahold of an O2 SIM card. Then my brother came home this morning and I used his SIM card... But when I stick it in, it doesn't have any reception... Does anyone know what I need to do??? for example, will i need to restore and then activate it with my brothers SIM in there??? Thanks guys.